linux-kernel - RE: [PATCH] PCI: imx6: Do not output error message when devm_clk_get() failed with -EPROBE

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Message-ID: <VI1PR04MB58535C5DF3141EA35674A7CF8C4B0@VI1PR04MB5853.eurprd04.prod.outlook.com>
Date:   Wed, 5 Aug 2020 05:45:10 +0000
From:   Richard Zhu <hongxing.zhu@....com>
To:     Anson Huang <anson.huang@....com>,
        "l.stach@...gutronix.de" <l.stach@...gutronix.de>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "robh@...nel.org" <robh@...nel.org>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH] PCI: imx6: Do not output error message when
 devm_clk_get() failed with -EPROBE_DEFER

> -----Original Message-----
> From: Anson Huang <Anson.Huang@....com>
> Sent: 2020年8月4日 13:38
> To: Richard Zhu <hongxing.zhu@....com>; l.stach@...gutronix.de;
> lorenzo.pieralisi@....com; robh@...nel.org; bhelgaas@...gle.com;
> shawnguo@...nel.org; s.hauer@...gutronix.de; kernel@...gutronix.de;
> festevam@...il.com; linux-pci@...r.kernel.org;
> linux-arm-kernel@...ts.infradead.org; linux-kernel@...r.kernel.org
> Cc: dl-linux-imx <linux-imx@....com>
> Subject: [PATCH] PCI: imx6: Do not output error message when devm_clk_get()
> failed with -EPROBE_DEFER
> 
> When devm_clk_get() returns -EPROBE_DEFER, i.MX6 PCI driver should NOT print
> error message, just return -EPROBE_DEFER is enough.
> 
> Signed-off-by: Anson Huang <Anson.Huang@....com>

I'm fine with these changes. Thanks.
Reviewed-by: Richard Zhu <hongxing.zhu@....com>

Best Regards
Richard Zhu

> ---
>  drivers/pci/controller/dwc/pci-imx6.c | 30 ++++++++++++++++++++----------
>  1 file changed, 20 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c
> b/drivers/pci/controller/dwc/pci-imx6.c
> index 4e5c379..ee75d35 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -1076,20 +1076,26 @@ static int imx6_pcie_probe(struct platform_device
> *pdev)
>  	/* Fetch clocks */
>  	imx6_pcie->pcie_phy = devm_clk_get(dev, "pcie_phy");
>  	if (IS_ERR(imx6_pcie->pcie_phy)) {
> -		dev_err(dev, "pcie_phy clock source missing or invalid\n");
> -		return PTR_ERR(imx6_pcie->pcie_phy);
> +		ret = PTR_ERR(imx6_pcie->pcie_phy);
> +		if (ret != -EPROBE_DEFER)
> +			dev_err(dev, "pcie_phy clock source missing or invalid\n");
> +		return ret;
>  	}
> 
>  	imx6_pcie->pcie_bus = devm_clk_get(dev, "pcie_bus");
>  	if (IS_ERR(imx6_pcie->pcie_bus)) {
> -		dev_err(dev, "pcie_bus clock source missing or invalid\n");
> -		return PTR_ERR(imx6_pcie->pcie_bus);
> +		ret = PTR_ERR(imx6_pcie->pcie_bus);
> +		if (ret != -EPROBE_DEFER)
> +			dev_err(dev, "pcie_bus clock source missing or invalid\n");
> +		return ret;
>  	}
> 
>  	imx6_pcie->pcie = devm_clk_get(dev, "pcie");
>  	if (IS_ERR(imx6_pcie->pcie)) {
> -		dev_err(dev, "pcie clock source missing or invalid\n");
> -		return PTR_ERR(imx6_pcie->pcie);
> +		ret = PTR_ERR(imx6_pcie->pcie);
> +		if (ret != -EPROBE_DEFER)
> +			dev_err(dev, "pcie clock source missing or invalid\n");
> +		return ret;
>  	}
> 
>  	switch (imx6_pcie->drvdata->variant) { @@ -1097,15 +1103,19 @@ static
> int imx6_pcie_probe(struct platform_device *pdev)
>  		imx6_pcie->pcie_inbound_axi = devm_clk_get(dev,
>  							   "pcie_inbound_axi");
>  		if (IS_ERR(imx6_pcie->pcie_inbound_axi)) {
> -			dev_err(dev, "pcie_inbound_axi clock missing or invalid\n");
> -			return PTR_ERR(imx6_pcie->pcie_inbound_axi);
> +			ret = PTR_ERR(imx6_pcie->pcie_inbound_axi);
> +			if (ret != -EPROBE_DEFER)
> +				dev_err(dev, "pcie_inbound_axi clock missing or invalid\n");
> +			return ret;
>  		}
>  		break;
>  	case IMX8MQ:
>  		imx6_pcie->pcie_aux = devm_clk_get(dev, "pcie_aux");
>  		if (IS_ERR(imx6_pcie->pcie_aux)) {
> -			dev_err(dev, "pcie_aux clock source missing or invalid\n");
> -			return PTR_ERR(imx6_pcie->pcie_aux);
> +			ret = PTR_ERR(imx6_pcie->pcie_aux);
> +			if (ret != -EPROBE_DEFER)
> +				dev_err(dev, "pcie_aux clock source missing or invalid\n");
> +			return ret;
>  		}
>  		/* fall through */
>  	case IMX7D:
> --
> 2.7.4